"If every additional user is putting money in the developers' pockets, then you're less likely to see the site disappear overnight." Yep. This is all quite sensible, and something I've long believed. (See also: Garrett Murray's pleading requests for Tumblr to let him pay for it).

"We were a niche site and in the course of eighteen months had siphoned off about six thousand users from our massive competitor, a pace I was was very happy with and hoped to sustain through 2011. But now the Senior Vice President for Bad Decisions at Yahoo had decided to give us a little help." Maciej on what Scaling Pinboard Fast actually looked like. Some good anecdotes in here.